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| author | Joe Hunkeler <jhunkeler@gmail.com> | 2015-08-11 16:51:37 -0400 |
|---|---|---|
| committer | Joe Hunkeler <jhunkeler@gmail.com> | 2015-08-11 16:51:37 -0400 |
| commit | 40e5a5811c6ffce9b0974e93cdd927cbcf60c157 (patch) | |
| tree | 4464880c571602d54f6ae114729bf62a89518057 /unix/f2c/libf2c/pow_ri.c | |
| download | iraf-osx-40e5a5811c6ffce9b0974e93cdd927cbcf60c157.tar.gz | |
Repatch (from linux) of OSX IRAF
Diffstat (limited to 'unix/f2c/libf2c/pow_ri.c')
| -rw-r--r-- | unix/f2c/libf2c/pow_ri.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/unix/f2c/libf2c/pow_ri.c b/unix/f2c/libf2c/pow_ri.c new file mode 100644 index 00000000..e29d416e --- /dev/null +++ b/unix/f2c/libf2c/pow_ri.c @@ -0,0 +1,41 @@ +#include "f2c.h" +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef KR_headers +double pow_ri(ap, bp) real *ap; integer *bp; +#else +double pow_ri(real *ap, integer *bp) +#endif +{ +double pow, x; +integer n; +unsigned long u; + +pow = 1; +x = *ap; +n = *bp; + +if(n != 0) + { + if(n < 0) + { + n = -n; + x = 1/x; + } + for(u = n; ; ) + { + if(u & 01) + pow *= x; + if(u >>= 1) + x *= x; + else + break; + } + } +return(pow); +} +#ifdef __cplusplus +} +#endif |